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An Indian migrant who was deliberately burnt to death behind the wheel of a Brisbane bus was the victim of a random attack that has horrified Australians, police believe.

Tributes are flowing for Manmeet Alisher, 29, a passionate singer and well-loved member of Australia's ex-pat Punjabi community, whose life ended in the most appalling way yesterday.

A passenger waiting on a Moorooka footpath climbed onto Alisher's bus just after 9am local time and hurled an incendiary device at him, engulfing the young man in flames as terrified passengers screamed and fought to escape.

Queensland Police Commissioner Ian Stewart says there was nothing to suggest terrorism or racial motivations were a factor in an attack he described as disturbing.

Nyok said has told of his confusion after coming across the blazing vehicle. He began kicking at a back door when he heard screaming.

"I thought the driver would open the door for them but nah, I stood a few seconds and nothing was happening so I decided to do something about it," he told the Nine Network. "Everyone was shaking ... I was just holding the door until the last one got out."

Veteran police Superintendent Jim Keogh said there was no hope for the driver, who was enveloped in flames. "He would have stood little chance."

Alisher was remembered on social media by members of the Indian community. "It's devastating news, hard to believe. He was our hero. It's very big loss to Punjabi community across the world," Baldev Singh Nijjar wrote.

Shock and anger has already started to emerge among other bus drivers, who've long bemoaned the lack of government action on driver safety.

Just four weeks ago, the Queensland Government announced a wide-ranging review into bus driver safety, after sustained pressure from drivers and the Rail Tram and Bus Union.

In announcing the review, Transport Minister Stirling Hinchliffe revealed there had been more than 350 assaults on bus drivers across the state in the previous six months.